condition mean min max ZT0-3 7.865785000000001 7.865785000000001 7.865785000000001 ZT4-7 4.564055 4.564055 4.564055 ZT8-11 3.662845 3.662845 3.662845 ZT12-15 13.972449999999998 13.972449999999998 13.972449999999998 ZT16-19 17.245350000000002 17.245350000000002 17.245350000000002 ZT20-23 12.221599999999999 12.221599999999999 12.221599999999999